A relish is a cooked or pickled sauce, usually made with vegetables or fruits, generally used as a condiment. It can be smooth or chunky, sweet or savory, hot or mild.
Thus, chutneys and pickles may both be considered relishes. Other relishes include ajvar.
Relish can be mixed with mayonnaise to form tartar sauce.
- Relishes at recipe source (http://www.recipesource.com/side-dishes/relishes/)